<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
      document.oncontextmenu=function(){//oncontextmenu 表示下来菜单
          return false;//这样就能阻止系统的默认行为
      };
    </script>
</head>
<body>

</body>
</html>